Jason is largely correct. The V-Max is geared at 2.0 versus 1.8 for a little more low end. I own a 2002 150 V-Max HPDI on a 1775 Pro-V SE and let me tell you that V-Max is one sweet machine. Once you get it propped right, they are a lot of fun...

I have a 14 x 19 3-blade stainless that turns about 5400 rpm's and I currently get right about 50 mph per my gps. I'm mounted one hole up from the bottom. I could probably do a little better but I carry a lot of gear and usually fill the gas tank... Good luck...

There are some differences. But the biggest factor you need to concern yourself with...is the fact that the Vmax HPDI's only come in 20" shafts...while the "regular" HPDI 150's come with either 20" or 25" shafts.

If you have a 25" transom, you only have one choice. Or if you were looking at the 175 or 200, you only have one choice (as those higher hp "regular" HPDI's only come in 25" and the V's only come in 20").

If you have a 20" transom...I'd get the Vmax...simply because it looks so freakin' cool.